Physics
posted by Justin on .
An arrow with a mass of 30g is shot straight up to a height of 130m what is the arrow's initial velocity?

Potential energy at max height = (initial kinetic energy)
m g h = (1/2) m V^2
Cancel the m's and solve for V 
ok thanks that is what i thought it might be but i just wanted to make sure. I also have another problem that i am hoping that you could help me with. A car requires 30 horsepower to move at a constant 20m/s what is the amount of friction that is needed to overcome?